Pollen Rupture and Its Impact on Precipitation in Clean Continental Conditions

Pollen Rupture and Its Impact on Precipitation in Clean Continental Conditions
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清洁大陆条件下花粉破裂及其对降水的影响

DOI:
10.1029/2018gl077692
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发表时间:
2018
影响因子:
5.2
通讯作者:
A. Steiner
A. Steiner
中科院分区:
地球科学1区
文献类型:
--
作者:
M. C. Wozniak;F. Solmon;A. Steiner

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植物散发出的花粉粒会破裂,释放出亚花粉颗粒(SPPs)作为大气微粒。以前的实验室研究表明,SPPs作为有效的云凝结核(CCN)的潜力。我们开发了第一个大气花粉破裂模型,并在美国春季花粉季节的区域气候模式模拟中使用CCN依赖的湿度方案实现了该机制。由于相对湿度和降雨的分布,SPPs的来源(表面或大气)取决于地区,有时还取决于季节。SPPs的模拟浓度约为1-10或1- 1,000 cm-3,取决于每个花粉粒产生的SPPs数量(nspg)。较低的nspg(103)对降水的影响可以忽略不计,但在清洁大陆CCN背景浓度(100 CCN/立方厘米)中的高nspg(106)表明,SPPs将平均季节降水量抑制了32%,并在增加干燥天数的同时使降水量从重到轻的变化率降低。对于污染的空气,这种影响较小(减少2%)。
Pollen grains emitted from vegetation can rupture, releasing subpollen particles (SPPs) as fine atmospheric particulates. Previous laboratory research demonstrates potential for SPPs as efficient cloud condensation nuclei (CCN). We develop the first model of atmospheric pollen grain rupture and implement the mechanism in regional climate model simulations over spring pollen season in the United States with a CCN‐dependent moisture scheme. The source of SPPs (surface or in‐atmosphere) depends on region and sometimes season, due to the distribution of relative humidity and rain. Simulated concentrations of SPPs are approximately 1–10 or 1–1,000 cm−3, depending on the number of SPPs produced per pollen grain (nspg). Lower nspg (103) produces a negligible effect on precipitation, but high nspg (106) in clean continental CCN background concentrations (100 CCN per cubic centimeter) shows that SPPs suppress average seasonal precipitation by 32% and shift rates from heavy to light while increasing dry days. This effect is smaller (2% reduction) for polluted air.
DOI: 10.1002/asl.397
发表时间: 2012-10
影响因子: 3
作者:
P. T. Griffiths;J.-S. Borlace;P. Gallimore;Markus Kalberer;Michael Herzog;Francis D. Pope
通讯作者: P. T. Griffiths;J.-S. Borlace;P. Gallimore;Markus Kalberer;Michael Herzog;Francis D. Pope
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DOI: 10.5194/gmd-2017-105
发表时间: 2017
期刊: Geoscientific Model Development Discussions
影响因子: --
作者:
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通讯作者: Steiner, Allison